Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at ayp.a(SourceFile:199)
	at ayf.b(SourceFile:383)
	at ayf.a(SourceFile:260)
	at ayo.a(SourceFile:122)

---- Minecraft Crash Report ----
// You're mean.

Time: 9/19/13 12:47 PM
Description: Rendering screen

java.lang.NullPointerException
	at ayp.a(SourceFile:199)
	at ayf.b(SourceFile:383)
	at ayf.a(SourceFile:260)
	at ayo.a(SourceFile:122)
	at big.b(SourceFile:837)
	at awo.aa(SourceFile:758)
	at awo.e(SourceFile:681)
	at net.minecraft.client.main.Main.main(SourceFile:104)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at ayp.a(SourceFile:199)
	at ayf.b(SourceFile:383)
	at ayf.a(SourceFile:260)
	at ayo.a(SourceFile:122)

-- Screen render details --
Details:
	Screen name: ayo
	Mouse location: Scaled: (165, 219). Absolute: (331, 40)
	Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2
Stacktrace:
	at big.b(SourceFile:837)
	at awo.aa(SourceFile:758)
	at awo.e(SourceFile:681)
	at net.minecraft.client.main.Main.main(SourceFile:104)

-- System Details --
Details:
	Minecraft Version: 13w38a
	Operating System: Mac OS X (x86_64) version 10.8.4
	Java Version: 1.6.0_51, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 74472408 bytes (71 MB) / 125636608 bytes (119 MB) up to 10728701952 bytes (10231 MB)
	JVM Flags: 1 total; -Xmx10G
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w38a
	LWJGL: 2.9.0
	OpenGL: Intel HD Graphics 4000 OpenGL Engine GL version 2.1 INTEL-8.12.47, Intel Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: Canadian English (CA)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null